A smartphone originally costs \$800 but is now sold for $\$680$. Determine the percent decrease in price.

• A. Percent discount = $15\%$
• B. Percent discount = $0.15\%$
• C. Percent discount = $0.18\%$
• D. Percent discount = $17.6\%$

Answer: (A)

Verified step by step guidance

1. Identify the original price and the new price. Here, the original price is \$800 and the new price is \$680.
2. Calculate the amount of decrease by subtracting the new price from the original price: \(\$800 - \$680\).
3. Use the formula for percent decrease: \(\text{Percent Decrease} = \left( \frac{\text{Amount of Decrease}}{\text{Original Price}} \right) \times 100\).
4. Substitute the values into the formula: \(\left( \frac{800 - 680}{800} \right) \times 100\).
5. Simplify the fraction and multiply by 100 to find the percent decrease.